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People prefer a relative humidity of 30 to 50% and find anything much higher to be very uncomfortable.
Unfortunately choosing in favour of a water system for distributing heating and air cooling has further consequences. A water system minimises the scope of pass-throughs in water-tight bulkheads but like many design decisions it forces trade-offs. It made makes an integrated ventilation/humidification system impossible.
The alternative to running fairly large air vents the length of the boat is local ventilation in the main zones of the boat. This is far from ideal. In both summer and winter the air intakes will be working against the air conditioning and heating systems, respectively, and deck-mounted dorades for intake and return air are multiple hull openings. The ventilation system must be designed carefully to minimise these risks of water entering.